Chemistry: electrical current producing apparatus – product – and – With nonbattery electrical component electrically connected...
Patent
1994-06-21
1996-04-16
Skapars, Anthony
Chemistry: electrical current producing apparatus, product, and
With nonbattery electrical component electrically connected...
429 62, 429120, 219209, 320 35, H01M 1050
Patent
active
055081266
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for improving the current output of a chargeable battery at low outside temperatures for a consumer, wherein a temperature sensor which is disposed fluid-proof and acid-proof in the interior of the battery releases a current flow for at least one heating element if the battery temperature falls below a predetermined set temperature value and the battery voltage is greater than a lower threshold value and less than an upper threshold value.
A device of the type described above is known (DE 90 12 327 U). As a heating element, this device contains a power transistor, which is fastened fluid-proof and acid-proof in the interior of the battery on a cooling element and which is provided with current by the battery during heating. By means of the battery heating device it is intended to maintain the temperature of the chargeable battery at a satisfactory level even at low outside temperatures in order to keep the interior battery resistance of the battery low during high current outputs during start-up of the battery. The thermal output is taken from the battery itself. The battery is discharged over time during extended periods of non-use and low outside temperatures. To prevent too extensive a discharge, the heater is turned off when the battery voltage has reached a lower threshold value, for example 12 Volt. This threshold value is a measure for the remaining charge in the battery. Once the battery has reached its remaining charge and the low outside temperatures continue, the battery becomes colder and takes on the temperature of the outside after some time. Then the battery again has unsatisfactory cold starting properties.
A device for temperature-controlled battery heating by means of a PTC thermistor, which is in good thermal contact with the cell and is electrically parallel connected with it, is disclosed in DE 33 40 882 C1. If the temperature of the cell rises or falls, the PTC thermistor counteracts this by decreasing or increasing its thermal output. The thermal output of the PCT thermistor is adapted by means of its appropriate size, taking the thermal contact surface into consideration.
The invention takes over here and has as its object the development of a device which lends favorable starting properties to a battery even if the battery had been subjected to low outside temperatures over a relatively long time without recharging.
This object is attained in a device of the type described at the outset in that a trigger circuit is provided which reacts to the rise in battery voltage after the current in a consumer with high current consumption has been turned off and actuates a timing circuit which controls the power transistor so it is conducting for a set period of time if the battery voltage lies below the lower threshold value or is equal to it.
After the battery voltage has dropped to the lower threshold value, the battery is still sufficiently charged for providing the heating current for some time and then to provide the current for starting the engine. The above described device detects the voltage condition of the battery and the drop in dynamic voltage caused by turning on the ignition or a strong consumer (cigarette lighter). Turning off the consumer activates the heater for a defined period of time via the trailing edge of the voltage change and places the battery into the optimum operational state again. The heater is turned off during the starting process itself. In case of an unsuccessful engine start the battery continues to be heated during the remaining time interval. This process can be repeated as often as desired.
The above mentioned object is furthermore attained with a device of the type described at the outset in that the temperature sensor controls the connection of the battery with a device which delivers a charging voltage for the battery and which is charged by means of the battery during a period of time when there is no recharging. With this device the properties of the battery for delivering a strong current at low outside temperatur
REFERENCES:
patent: 4650729 (1987-03-01), Nakamura et al.
patent: 5284719 (1994-02-01), Landau et al.
patent: 5290643 (1994-03-01), Chen
patent: 5362942 (1994-11-01), Vanderslice, Jr. et al.
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